The most striking argument against "I've got nothing to hide" is that it's wrong, because many of us in fact must hide something: Take for instance the terms an

The most striking argument against "I've got nothing to hide" is that it's wrong, because many of us in fact must hide something: Take for instance the terms and conditions that you have to agree to when you sign up for a Visa card or Mastercard: https://www.cardcomplete.com/media/medialibrary/2021/03/AGBs_Kreditkarten_ENG_0719.pdf https://www.cardcomplete.com/media/medialibrary/2021/03/AGBs... Quoting from the text (section 5.5): "The Cardholder must not disclose the assigned PIN, nor any personally chosen PIN (see Item 17.8.), nor the Secure Code to anyone, not even to employees of card complete. The Cardholder is responsible for ensuring strict secrecy concerning all card security details – PIN, Secure Code and mobileTANs received on his/her telephone (to be used for authenticating a ViS/MCID transaction and valid for a maximum of 5 minutes after receipt) – and must take all reasonable precautions to ensure that they cannot be discovered by others." Thus, if you sign these conditions, you are obligated to keep this information secret. Similar obligations are imposed on customers for other cards and in other circumstances, in communication with banks, insurance companies etc. To keep these secrets, we need secure ways to store this information, and secure ways to communicate.